the same time; and that a mould, when once formed, must, according to these laws of affinity, produce a succession of others exactly resembling the original. By combining these attributes, common to animal and vegetable Nature, he discovered, that there existed in both an inexhaustible and reversible fund of organic and living substance; a substance as real as the unformed matter; a substance which continues always in its live as the other does in its inactive state; a substance universally diffused, passing from vegetables to animals by means of nutrition, returning from animals to vegetables by the process of putrefaction, and maintaining an incessant circulation for the animation of beings. He also remarked, that these organic particles existed in every organized body; that they were combined in greater or less quantities with dead matter; that they were more abundant in animals where all is full of life, and more scarce in vegetables where the dead matter predominates, and the living seems to be extinct; where the organic matter, overpowered by the rude, has neither progressive motion, sensation, heat, nor life, and is only manifested by its unfolding and reproduction. Reflecting on the manner each operates, he discovered, that every living being is a mould that possesses the power of assimilating the substances by which it is nourished; that growth is an effect of this assimilation, that the unfolding of a living body is not a simple augmentation of bulk, but an extension in every dimension, and a penetration of new matter into every part of the whole mass; that those parts increasing in proportion to the whole, and the whole in proportion to the parts, the form is preserved, and remains always the same till the growth is completed; that when the body has acquired all its extent, the same matter heretofore employed in the augmentation, is sent back as superfluous from every part to which it had been assimilated; and that, by uniting in one common point, it forms a new being, perfectly like the first, and which to attain the same dimensions, requires only to be expanded by the same mode of nutrition. He also observed that man, quadrupeds, cetaceous animals, birds, reptiles, insects, trees, plants, and herbs, were all nourished, unfolded, and reproduced by the same universal law; and that the manner of their nutrition and generation appearing so different, although dependent on one general and common cause, was because it could not operate but in a mode relative to the form of each particular species of being. To acquire these grand truths, required a succession of ages, and gradual investigation, but having obtained so much, he began to compare different objects together; and to distinguish one from the other, he gave them particular names, and invented general denominations to reunite them under one point of view. He observed, by taking the body of man as the physical model of every living animal,